Physics – Condensed Matter – Materials Science
Scientific paper
2012-04-10
Physics
Condensed Matter
Materials Science
5 pages, 2 figures, 1 table
Scientific paper
We study using the Bethe-Salpeter formalism the excitation energies of the zincbacteriochlorinbacteriochlorin dyad, a paradigmatic photosynthetic complex. In great contrast with standard timedependent density functional theory calculations with (semi)local kernels, charge transfer excitations are correctly located above the intramolecular Q-bands transitions found to be in excellent agreement with experiment. Further, the asymptotic Coulomb behavior towards the true quasiparticle gap for charge transfer excitations at long distance is correctly reproduced, showing that the present scheme allows to study with the same accuracy intramolecular and charge transfer excitations at various spatial range and screening environment without any adjustable parameter.
Blase Xavier
Deutsch Thierry
Duchemin Ivan
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